Effects of Age on \( (\dot V{O_2}) \) Kinetics During Calf and Cycling Exercise

  • P. D. Chilibeck
  • D. H. Paterson
  • D. A. Cunningham
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 393)


The kinetics of oxygen uptake \((\dot V{O_2})\)adjustment to moderate intensity cycling exercise are slowed as a function of age (1,5). This implies that older individuals must rely on anaerobic systems, to a greater extent, to meet energy requirements during transitions to exercise, increasing the possibility of early fatigue. The purpose of this study was to compare \(\dot V{O_2}\) kinetics between old and young subjects during an exercise of a smaller muscle mass (ankle plantar flexion). Ankle plantar flexion was performed using an ergometer, developed to measure kinetics with 31P-nuclear magnetic resonance spectroscopy (NMRS), where phosphocreatine kinetics correspond to muscle respiratory kinetics (3,10,15). Since plantar flexor muscles of older individuals have decreased capillarization and oxidative enzyme activity (4,7) and a greater amount of “non-muscle” tissue than young (14), we expected to find a slow oxygen delivery, or oxygen utilization at the start of exercise. This would result in an impairment of \(\dot V{O_2}\) kinetics with age.


Plantar Flexion Plantar Flexor Cycling Exercise Cycle Ergometry Oxidative Enzyme Activity 
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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • P. D. Chilibeck
    • 1
  • D. H. Paterson
    • 1
  • D. A. Cunningham
    • 1
  1. 1.The Centre for Activity and Ageing Faculties of Kinesiology and MedicineThe University of Western OntarioLondonCanada

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